Chapter 6, Problem 6.125EP

A friction-free, weighted piston-cylinder device contains 2.0 kg of water in a mixed state at a pressure of 150kPa and a quality of 0.60. As it sits there, heat is lost until the mixture becomes entirely a saturated liquid. How much heat is lost jn the process?

A spring-loaded piston-cylinder device contains   of carbon dioxide. Initially, the spring has no force on the piston and  , , . Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2,  , . The gas is an ideal gas. (1)How to determine the pressure  at the state 2?     A.     B.     C.     D.

Saturated water mixture in a piston cylinder arrangement is initially at 200 oC with a qualityof 50%. The mixture loses heat to the surrounding and contracts isothermally to half of theinitial volume.a- What is the final pressure and the specific work done during the process?b- Draw the process on P-v diagram.

10 litres of hot water at 70°C is mixed with an equal volume of cold water at 20° C. Find the resultant temperature of the water. (Specific heat of water = 4200.J / kg – K).

A piston cylinder contains  11 kg of air at 20 degC and 300 kPa. It is now heated up in a constant pressure process to 600 K. Find the final volume.   (R of air = 0.287 KJ/kg K)

QUESTIOΝ 1: A piston-cylinder arrangement contains 2 kg of steam originally at 200°C and x-0.9. The volume triples while thc temperature is held constant. Pisten Calculate: (a) the final pressure, in MPa, 7,-200 C (c) the change in intermal energy, in kl.

A rigid container contains saturated vapour at 1.6 bar.  The container is cooled by -440 KJ and the pressure drops to 1 bar.  Calculate the mass of water in the container in kg.  Neglect kinetic and potential energy changes. Note that the reported heat transfer is negative because energy is leaving the container. It is closed system As the container is rigid, the volume and total mass will stay the same between the initial and final state.  This means that the specific volume of water will stay constant.  Use the information in the bullet above to fine the quality of the mixture at the final state. Then, use the quality to perform the energy balance.

QI) A constant pressure piston cylinder contains 0.2 kg water as saturated vapor at 400 kPa. It is now cooled so the water occupies half the original volume. Find the work in the process. (-18.5 kJI

A cylinder fitted with a piston has a volume of 0.1 m'and contains a 0.8 kg of steam at 0,.4 MPa. Heat is trausferred to the steam umntil the temperature is 250°C, while the pressure remmains constant. (1) vi (specific volume) in m'kg = (2) v: (specific volume) in m'kg = (3) xi (quality) = . (4) us (specific internal energy) in k/kg (5) uz (specific internal energy) in kJ/kg =. (6) Xx: (quality)= (7) Phase description at imitial state is. (8) Phase description at fitsal state is (9) W (work) in kJ= (10) Q (heat) in kJ =